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The Paradox of Neutrons and Protons
The nucleus itself, there's a sort of paradox there because all those protons, each of them with positive charge, somehow crammed together. So how does the nucleus stay together at all? And it turns out that it's a very strong force that neutrons and protons feel, so long as they're touching each other. If you've got too many protons, the electrical force will still overwhelm that strong force.